So I just got the powders in and coated a couple of pieces. This is my very first time doing this but I am extremely impressed so far.
Here’s the question - one of my pieces didn’t get powdered on the other side as well as my other pieces. Can I re-apply powder and cure it again?
yes, they say to scuff the piece with a pad. I have done it without this step and It worked fine.
Thanks brother. I’ll try and clean it up tomorrow.
You can also warm the part before respraying.
BTW, if you put a rotating hook in your booth & hang the parts from that it makes it easier to get full consistent coverage. I also have a similar hook in the ceiling of my oven so I don’t have to jostle things more than absolutely necessary.
Thanks Jim. I have a hook that I attached a rotating hook to.
I don’t know why my pictures are rotating.
You should really strip the piece and re shoot it if you have already fully baked the part. Powders have a set time and temp that they should be baked out. Typically powder manufacturers do give you some leeway but by baking a color multiple times, it can cause defects such as delamination. I can’t tell you how many pieces I have chemical stripped, outgassed, re sand blasted just because of improper adhesion
Also if you are doing multiple coats such as a color then a clear top, don’t fully cure the base coat. I typically shoot the color, once it gets to 300°, I remove the part, let it cool to about 175*, shoot the top coat, then bake at what ever temp and time the top coat calls for. Only time you fully cure the base coat, is if your shooting a chrome base
What chemical do you use to strip metal of the powder? This piece is so small I’ll probably just die grind it.
Also, don’t I fully cure everything that is just going to be a single color? Chrome would be cured fully if another color is added?
I haven’t gotten this technical yet and thanks for the help.
That explains it - now I can see the hooks 
Correct! If it’s just a single coat your shooting, fully cure it. And I just use a aircraft paint stripper. You can buy it from Auto zone. Make sure your wear proper ppe when applying it. It will burn the crap out of your skin. Once stripped I recommend degreasing with simple green, out gassing then sand blast and reshoot
You don’t just re-blast it? I’m using 80 grit glass bead for that. My other go-to media is coal slag. Why bother with the chemical stripping?
I don’t have a sandblaster. So I’ll do my normal; strip, grind or sand, acetone, tack cloth, cook, powder then cure.
I use aluminum oxide for all my blasting so it doesn’t take off the powder near as fast as stripping does. Maybe the glass bead is a bit more abrasive
Well I tried to scuff the one that didn’t come out so great yesterday and it didn’t come out so great today. On the other hand I did my first Yeti type tumbler today. I’m super impressed with the powder coating and how professional it looks when it’s done.
I made my own stands. It’s a variation of different ones I saw on the Internet. Used the CNC to cut out several metal discs to place on a 3/8” threaded rod. Actually came out pretty good. I don’t see myself doing many tumblers but my wife wanted a couple of them done for Christmas gifts.
The only thing that’s a pain is that when you switch powder colors you have to clean the gun out. Not too much of a headache but just a time killer. I guess you’d have to do the same with spray/air paint as well if you used a gun.
Do you have a favored brand of stripper for removing your pc to reshoot
Thanks
I haven’t found a paint stripper that will take the powder coat off. That was going to be my next question. Also, where is a good place to buy powder? From what I’m seeing it’s about $10-18/pound bagged. I bought some to start out with around that price range. This place I bought it from had it to me in three days.
What are you guys doing as far as cleaning your gun out between colors?
Thanks.
I just use “air craft stripper” from Auto zone to strip powder. Typically I turn my regulator to 60 psi, disassemble the tip assembly and blow everything out. Then hook the hose to the gun and squeeze the trigger a few times. As far as where to get powder, I typically buy from prismatic powders or the powder coat store.
Thanks,
I will stop by today and see if I can find the paint stripper and just re-shoot the parts.
Found it. Hopefully this will take off a single coat off spray enamel.
